Peter
Ferdinand Drucker is revered as the
father of modern corporate management.
He was often called the world's most
influential business guru. His thinking
transformed corporate management in the
latter half of the 20th century.

Internal

The unexpected – the
unexpected success, the unexpected
failure, the unexpected outside
event

The incongruity – between
reality as it actually is and reality as it is assumed to be or as
it "ought to be"